<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        {{msg | msgFilter}}
    </div>
    <script src="./js/vue.js"></script>
    <script>
        new Vue({
            el:'#app',
            data:{
                msg: 'hello'
            },

            filters: {
                msgFilter(val) {
                    // console.log(val);
                    let text = val + ' world'
                    return text
                }
            }
        })
    </script>
</body>
</html>